Gravytub

So here's what I'm looking at.
I carry around my tamagotchi around like it's my phone, always in my pocket. But I also ALWAYS have the sound off, simply because my tama seems to beep at the most inopportune times.
However, if I keep it silent, I'll get home from someplace and he'll be sick and dying!

I've given it some thought, and I wonder if you could solder some sort of vibrator where the sound do-hicky (for lack of a better term) is at. Perhaps one of the techy tama-owners could help me out. Thanks